八、名词性从句专题四 语法填空和短文改错[ 命题分析 ]名词性从句是高考的必考点,它在句中可以作主语、宾语、表语和同位语。语法填空题和短文改错题对名词性从句的考查集中在引导词上,其中连接代词 that 与 what , if 与whether 是考查的重点。解决名词性从句的问题的关键是:一、通过从句的位置,辨别从句的类型;二、分析从句,看看从句中所缺少的句子成分和句意,最终确定选用合适的连接词。专题四 语法填空和短文改错 主 语 从 句1 .主语从句的引导词。连接词连接代词连接副词 that , whether , if只起连接作用,不在从句中作成分。what , who , whom ,which , whichever ,whatever , whoever在从句中作主语、宾语、表语或定语。when , where , how , why在从句中作状语。♦(2015· 高考北京卷 ) How we understand things has a lot to do with what we feel.我们如何理解事情与我们所感受到的有很大关系。♦(2014· 高考陕西卷 )When the delayed flight will take off depends much on the weather. 那架延误的班机什么时候会起飞在很大程度上取决于天气。♦(2014· 高考北京卷 )Some people believe whatever has happened before or is happening now will repeat itself in the future. 一些人认为,无论是以前发生过的还是现在正在发生的事情,在将来都会再次发生。易错警示(1)that 引导主语从句时一般不省略。(2) 当主语从句位于句首时,常用 whether 引导,而不用 if 。2 .形式主语。it 作形式主语的常见的句型:(1)It + be +形容词 (necessary/likely/important/certain 等 )+ that 从句(2)It + be +名词 ( 短语 )(a pity/a shame/no wonder 等 ) +that 从句(3)It + be +过去分词 (said/told/reported 等 ) + that 从句(4)It +不及物动词 (seem , appear , happen , matter 等 ) + that 从句♦ It remains to be seen whether the newly formed committee’s policy can be put into practice. 这个新形成的委员会的政策能否实施还有待观察。♦ It is uncertain what side effect the medicine will bring about , although about two thousand patients have taken it. 尽管大约两千名患者已经服用了这种药,但...